The Initial Owner of the Original Code is European Environment Agency (EEA).
All Rights Reserved.

The EEA Google Charts (the Original Code) is free software;
you can redistribute it and/or modify it under the terms of the GNU
General Public License as published by the Free Software Foundation;
either version 2 of the License, or (at your option) any later
version.

Upgrade step: Within “Plone > Site setup > Add-ons” click on
upgrade button available for eea.googlecharts.
For non-Plone usage you’ll have to manually run @@migrate-dashboards for all
visualizations that have Google-Dashboard enabled.